Excerpt from Psychological Monographs, 1926, Vol. 36: University of Iowa Studies in Psychology, No. X Introduction; method and apparatus; results and interpretation: relation ship between the intensity of the stimulus and the refractory period when the observer is relatively dark adapted, relationship between the amount of dark adaptation and the intensity with a constant time between stimuli of 30 seconds, relation between the amount of dark adaptation and, the refractory phase when the intensity is kept constant; summary; bibliography. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.